Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 462
BOOK IX 451 … 982. Def. A lune is a closed figure on the surface of a spherewhose boundary is composed of twosemicircumferences of great circles, asNASB. 983. Defs. The two semicircumfer-ences are called the sides of the lune,as NAS and NBS; the points of inter-section of the sides are called thevertices of the…
Geometry, Plane · Geometry, Solid
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